Again I don't know the scope of US mandatory deposit. But in the countries such as the UK, the Scandinavian countries, or Germany tall issues of such a newspaper would already be in the archive of the national library, in two copies.
Basically, as I understand it, there is none. If you want to collect copyright infringement damages, you have to register for copyright, pay, and deposit a copy. Otherwise you have a copyright on creation and don't need to deposit anything. The vast majority of created works are not deposited anywhere.
